To engage in speculation (especially financial) without possessing actual goods or capital, profiting from price differences; figuratively, to carry out insubstantial or deceptive opportunistic activities.
他整天研究股市曲线，希望能通过买空卖空快速致富，却忽略了其中的巨大风险。
He spends all day studying stock market trends, hoping to get rich quickly through speculation, but ignores the huge risks involved.
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